Pen



FIG. 1 is a front elevational view of a pen showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a perspective view thereof; and,

FIG. 8 is a perspective view of the pen with its caps detached.

The broken lines shown on the cap in FIGS. 5, 6, 7, and 8 are to show portions of the pen that form no part of the claimed design. 

CLAIM The ornamental design for a pen, as shown and described. 